Improved conglomerate for fa vino, roofing, and similar purposes



dilated fifties FRANK N. HOPKINS, OF BALTIMORE, MARYLAND.

Letters Patent No. 97,088, (la-ted November 23, 1869.

I IMPROVED CONGLOMERATEI'OR PAVING, ROOFING, AND SIMILAR PURPOSES.

-0--P The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern-.-

Be it known that], FRANK N. HOPKINS, of the city and county of Baltimore, and State of Maryland, have invented a new and useful Conglomerate, Designed to be Used for Paving, Roofing, and like Purposes; and I do hereby declare that the following is athll, clear, an'd, e xact descliption of the same.

My invention consists in combining with pine-tar the substance known as Ritchie mineral, sometimes .tcrmed crystallized petroleum, and also Grahamite, and also combining with the pine-tar the substance known as Albertite, the latter being used with the, R tchie mineral, or either used separately, as desired, the two. substances above named being nearly the same, or identical, as regards their constituent parts. Sand and gravel, either or both, are also used, or combined with the three first-named substances. 7

To enable thdse skilled in the art to fully understand and manufacture my improved conglomerate, I will proceed to describe the process of manufacture, and the mode of applying it, or preparing it for use.

The Ritchie mineral and Albertite are first ground or reduced, in any propel-way, to a fine powder, and these substances combined, or either of them sepai'ately, are mixed with the pine-tar, all being in a cold state while being mived, and afterward heated to about 300 Fahrenheit, so that the Ritchie mineral, or Albertite, or both, will be dissolved in the tar.

The sand and gravel, either or both, or any equivalent substance which maybe used in their stead, such as crushed cinders, are heated separately, and then' mixed with the tar-solutiom The object in heating the sand, gravel, or their equivalent, is to prevent the latter from cooling the tar-solution when mixed with it. All the substances above named are thoroughly mixed, and the conglomerate is then ready for use.

For paving or strcetnu'poses, it may be spread upon the-surface and rolled compactly by heavy rollers, or it may be moulded into bricks or blocks, under pressure, of any desired shape and size. 7 These bricks, or blocks may be transported any distance to the locality where designed for use, and then be incited and spread over the surface n'operly prepared, or, it designed forpaving or street-use, the bricks or blocks may be laid in a solid state, and cemented together by a mixture of pine-tar and Ritchie mineral, or Albertitc, either or both of the latter. combined, one hundred parts of pine-tar to lit'ty parts" of the Ritchie mineral or AIbcrt-ite, or fifty parts of the two last-named substances combined.

The proportions of the parts, in making the conglomerate, are, pine-tar, one hundred parts; Ritchie mineral or Albertite, separately or combined, fifty parts; sand, seven hundred parts; gravel, eleven hundred and fifty parts.

Having thus described my invention,

.'What I claim as new, and desire to secure by Letters Patent, is-

The use of pine-tar, in combination with Ritchie mineral or Albertite, either or both, and sand, grave], or other equivalent substance, to form a conglomerate t'or paving, rooting, and analogous purposes, prepared in the manner substantially as herein set forth.

' FRANK N. HOBKIN S.

Witnesses:

Geo. A. HEMMICK, BENTLEY B11312. 

